Segmentation by type classifies monoclonal antibodies into six engineering categories: Murine, Chimeric, Humanized, Fully human, Bispecific, and Antibody‑drug conjugates (ADCs). Murine antibodies, representing less than 5 % of the market, are largely phased out due to immunogenicity concerns. Chimeric formats hold about 12 % of sales, with rituximab as a benchmark product. Humanized antibodies dominate with roughly 35 % share, benefiting from improved safety profiles and broad oncology indications. Fully human antibodies, engineered via transgenic mice or phage display, capture approximately 28 % of the market, reflecting their expanding pipeline across multiple cancer types. Bispecific antibodies, designed to engage two distinct antigens, are an emerging segment contributing around 8 % of revenue, driven by recent approvals in hematologic malignancies. ADCs, which couple a cytotoxic payload to a targeting antibody, account for the remaining 12 % and are gaining traction as precision‑delivery platforms in solid‑tumor therapy.